1 /* 2 * OF graph binding parsing helpers 3 * 4 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. 5 * Author: Sylwester Nawrocki <[email protected]> 6 * 7 * Copyright (C) 2012 Renesas Electronics Corp. 8 * Author: Guennadi Liakhovetski <[email protected]> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of version 2 of the GNU General Public License as 12 * published by the Free Software Foundation. 13 */ 14 #ifndef __LINUX_OF_GRAPH_H 15 #define __LINUX_OF_GRAPH_H 16 17 /** 18 * struct of_endpoint - the OF graph endpoint data structure 19 * @port: identifier (value of reg property) of a port this endpoint belongs to 20 * @id: identifier (value of reg property) of this endpoint 21 * @local_node: pointer to device_node of this endpoint 22 */ 23 struct of_endpoint { 24 unsigned int port; 25 unsigned int id; 26 const struct device_node *local_node; 27 }; 28 29 /** 30 * for_each_endpoint_of_node - iterate over every endpoint in a device node 31 * @parent: parent device node containing ports and endpoints 32 * @child: loop variable pointing to the current endpoint node 33 * 34 * When breaking out of the loop, of_node_put(child) has to be called manually. 35 */ 36 #define for_each_endpoint_of_node(parent, child) \ 37 for (child = of_graph_get_next_endpoint(parent, NULL); child != NULL; \ 38 child = of_graph_get_next_endpoint(parent, child)) 39 40 #ifdef CONFIG_OF 41 int of_graph_parse_endpoint(const struct device_node *node, 42 struct of_endpoint *endpoint); 43 struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, 44 struct device_node *previous); 45 struct device_node *of_graph_get_remote_port_parent( 46 const struct device_node *node); 47 struct device_node *of_graph_get_remote_port(const struct device_node *node); 48 #else 49 50 static inline int of_graph_parse_endpoint(const struct device_node *node, 51 struct of_endpoint *endpoint) 52 { 53 return -ENOSYS; 54 } 55 56 static inline struct device_node *of_graph_get_next_endpoint( 57 const struct device_node *parent, 58 struct device_node *previous) 59 { 60 return NULL; 61 } 62 63 static inline struct device_node *of_graph_get_remote_port_parent( 64 const struct device_node *node) 65 { 66 return NULL; 67 } 68 69 static inline struct device_node *of_graph_get_remote_port( 70 const struct device_node *node) 71 { 72 return NULL; 73 } 74 75 #endif /* CONFIG_OF */ 76 77 #endif /* __LINUX_OF_GRAPH_H */ 78